[Intel-gfx] [PATCH V3 i-g-t] lib: Drop __kms_addfb() wrapper

[Chris Wilson]

Quoting Rodrigo Siqueira (2019-05-27 02:19:51)
> The function __kms_addfb() and drmModeAddFB2WithModifiers() have a
> similar code. Due to this similarity, this commit replaces all the
> occurrences of  __kms_addfb() by drmModeAddFB2WithModifiers() and adds
> the required adaptations.

No. There is a critical difference between the two: igt_ioctl. That
allows us to control the ioctl for error injection into the kernel.

If you want to test libdrm API and not the kernel, please add tests
to libdrm.
-Chris